haslet vs viscera

haslet

noun
  • The internal organs of an animal, especially the heart and liver of a pig. 

  • A meatloaf made of these organs. 

viscera

noun
  • Collectively, the internal organs of the body, especially those contained within the abdominal and thoracic cavities, such as the liver, heart, or stomach. 

  • The intestines. 

How often have the words haslet and viscera occurred in a corpus of books? (source: Google Ngram Viewer )